(JavaScript) PRODA Get OAuth2 Access Token using JWT

See more PRODA Examples

Note: This example requires Chilkat v11.0.0 or greater.

For more information, see https://www.servicesaustralia.gov.au/organisations/business/services/proda-provider-digital-access

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

var success = false;

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// First create a JWT to be sent in the POST to https://vnd.proda.humanservices.gov.au/mga/sps/oauth/oauth20/token

var privKey = new CkPrivateKey();

// Load an RSA private key from a PEM file.
// Chilkat provides alternative methods to load from other formats, or to load from a string or binary data.
success = privKey.LoadEncryptedPemFile("qa_data/pem/rsa_passwd.pem","passwd");
if (success == false) {
    console.log(privKey.LastErrorText);
    return;
}

var jwt = new CkJwt();

// Build the JOSE header
var jose = new CkJsonObject();
// Use RS256.  Pass the string "RS384" or "RS512" to use RSA with SHA-384 or SHA-512.
success = jose.AppendString("alg","RS256");
success = jose.AppendString("typ","JWT");
success = jose.AppendString("kid","test-device");

// Now build the JWT claims (also known as the payload)
var claims = new CkJsonObject();
success = claims.AppendString("iss","9646844092");
success = claims.AppendString("sub","test-device");
success = claims.AppendString("aud","https://proda.humanservices.gov.au");

// Set the timestamp of when the JWT was created to now.
var curDateTime = jwt.GenNumericDate(0);
success = claims.AddIntAt(-1,"iat",curDateTime);

// Set the timestamp defining an expiration time (end time) for the token
// to be now + 1 hour (3600 seconds)
success = claims.AddIntAt(-1,"exp",curDateTime+3600);

// Produce the smallest possible JWT:
jwt.AutoCompact = true;

// Create the JWT token.  This is where the RSA signature is created.
var jwtToken = jwt.CreateJwtPk(jose.Emit(),claims.Emit(),privKey);

// ---------------------------------------------------------------------
// Build and send the POST, which should look something like this:

// POST https://vnd.proda.humanservices.gov.au/mga/sps/oauth/oauth20/token HTTP/1.1
// Content-Type: application/x-www-form-urlencoded
// Content-Length: 666
// Host: vnd.proda.humanservices.gov.au
// 
// grant_type=urn%3Aietf%3Aparams%3Aoauth%3Agrant-type%3Ajwt-bearer&assertion=<jwt>&client_id=VendorClient03

var http = new CkHttp();

var req = new CkHttpRequest();
req.HttpVerb = "POST";
req.ContentType = "application/x-www-form-urlencoded";

// Add the request params.
req.AddParam("grant_type","urn:ietf:params:oauth:grant-type:jwt-bearer");
req.AddParam("assertion",jwtToken);
req.AddParam("client_id","VendorClient03");

var resp = new CkHttpResponse();
success = http.HttpReq("https://vnd.proda.humanservices.gov.au/mga/sps/oauth/oauth20/token",req,resp);
if (success == false) {
    console.log(http.LastErrorText);
    return;
}

console.log("Response status code = " + resp.StatusCode);
console.log("Response body:");
console.log(resp.BodyStr);